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Thread: Why is the sky?

  1. #1 Why is the sky? 
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    ¯\(°_o)/¯ Why is the sky?


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    Quote Originally Posted by Graeme Masque View Post
    ¯\(°_o)/¯ Why is the sky?
    Why is the sky, what? blue? on Mars red? falling? etc.


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    Quote Originally Posted by Graeme Masque View Post
    ¯\(°_o)/¯ Why is the sky?
    Because, man, like... what if, like, we're the sky man? That would be, like, totally, like, far out, man.
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    Quote Originally Posted by Graeme Masque View Post
    Why is the sky?
    Why is the sky? --> The sky is why? --> Yes. The sky is why. --> And why is the sky. --> Wow.
    Dis muthufukka go hard. -Quote
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    I'll go ahead and make an attempt at a more serious answer by guessing as to the intent of the question...

    Our planet has an atmosphere that is an "ocean of air" held down to Earth by gravity. It weighs quite a bit, causing the air pressure we measure and the vacuum effect we see on Earth when air pressure pushes air into vacant spaces.

    This ocean of air refracts light slightly. The longest wavelength of sunlight being the most visible. Blue.

    Since air pressure here at sea level is caused by the weight of all this air held down by gravity, there is no air pressure pushing our atmosphere out into space.
    However, solar radiation and many other factors (including how light hydrogen is) cause our planet to lose trace amounts of gases from our atmosphere over time.
    If our magnetosphere was weaker or the sun were to swell up into a Red Giant (Less diameter than 1 au) the solar wind would evaporate (boil/ blast away) our atmosphere and we'd look a lot more like Mars except different because Mars is smaller and kinda reddish. I mean would look as atmospherically challenged as Mars does. Just bigger.
    I did say that seriousness would be an attempt.
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    This doesn't belong in the physics secton. (moved)


    The longest wavelength of sunlight being the most visible.
    Blue is on the short wavelength end of the visible spectrum.
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    Quote Originally Posted by Lynx_Fox View Post
    This doesn't belong in the physics secton. (moved)


    The longest wavelength of sunlight being the most visible.
    Blue is on the short wavelength end of the visible spectrum.
    How humiliating.
    <Chuckle>
    Thanks for the correction.
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